file_manager: Add DriveAppRegistry::UpdateFromAppList()

chrome/browser/chromeos/drive/drive_app_registry.h

Index: chrome/browser/chromeos/drive/drive_app_registry.h
diff --git a/chrome/browser/chromeos/drive/drive_app_registry.h b/chrome/browser/chromeos/drive/drive_app_registry.h
index 8820d2e9584b9dfe8b53b3ece1f38ca260312c4f..a3e86e52eb8699386c9ac0d6d95ed756fac2f641 100644
--- a/chrome/browser/chromeos/drive/drive_app_registry.h
+++ b/chrome/browser/chromeos/drive/drive_app_registry.h
@@ -73,6 +73,9 @@ class DriveAppRegistry {
   // Updates this registry by fetching the data from the server.
   void Update();
 
+  // Updates this registry from the |app_list|.
+  void UpdateFromAppList(const google_apis::AppList& app_list);
+
  private:
   // Defines application details that are associated with a given
   // file extension or content mimetype.